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CVE-2025-7338— Multer vulnerable to Denial of Service via unhandled exception from malformed request

Quick assessment

Affected
expressjs multer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Multer是expressjs开源的一个用于Node.js中间件。 Multer 1.4.4-lts.1至2.0.2之前版本存在安全漏洞，该漏洞源于处理畸形多部分上传请求时存在未处理异常，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.75% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-7338

Vulnerability Information
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Vulnerability Title
Multer vulnerable to Denial of Service via unhandled exception from malformed request
Source: CVE Program / CVE List V5
Vulnerability Description
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Multer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Multer是expressjs开源的一个用于Node.js中间件。 Multer 1.4.4-lts.1至2.0.2之前版本存在安全漏洞，该漏洞源于处理畸形多部分上传请求时存在未处理异常，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
expressjs multer 1.4.4-lts.1 ~ 2.0.2 -

II. Public POCs for CVE-2025-7338

# POC Description Source Link Shenlong Link
1 Test to validate CVE-2025-7338 https://semgrep.dev/orgs/-/advisories?f=CAAQGRoTCg1jdmUtMjAyNS03MzM4GgAiAA%3D%3D https://github.com/r2c-CSE/multer-sca-rule-test_cve-2025-7338 POC Details
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Qwen3.6-35B-A3B · 9011 chars
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III. Intelligence Information for CVE-2025-7338

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IV. Related Vulnerabilities

Same product: multer
Same vendor: expressjs
Same weakness: CWE-248

V. Comments for CVE-2025-7338

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